[FFmpeg-devel] [PATCH v4] mdct15: add assembly optimizations for the 15-point FFT

[Paul B Mahol]

On 6/23/17, Michael Niedermayer <michael at niedermayer.cc> wrote:
> On Fri, Jun 23, 2017 at 02:51:37AM +0100, Rostislav Pehlivanov wrote:
>> c:    1802 decicycles in fft15,16774635 runs,   2581 skips
>> avx:   865 decicycles in fft15,16776378 runs,    838 skips
>>
>> Signed-off-by: Rostislav Pehlivanov <atomnuker at gmail.com>
>> ---
>>  libavcodec/mdct15.c          | 182
>> +++++++++++++++++++++----------------------
>>  libavcodec/mdct15.h          |  26 +++----
>>  libavcodec/x86/Makefile      |   2 +
>>  libavcodec/x86/mdct15.asm    | 137 ++++++++++++++++++++++++++++++++
>>  libavcodec/x86/mdct15_init.c |  95 ++++++++++++++++++++++
>>  5 files changed, 333 insertions(+), 109 deletions(-)
>>  create mode 100644 libavcodec/x86/mdct15.asm
>>  create mode 100644 libavcodec/x86/mdct15_init.c
>
>
> seems to fail to build here:
>
> libavcodec/x86/mdct15.asm:116: error: invalid combination of opcode and
> operands
> libavcodec/x86/mdct15.asm:117: error: invalid combination of opcode and
> operands
> libavcodec/x86/mdct15.asm:118: error: invalid combination of opcode and
> operands
> make: *** [libavcodec/x86/mdct15.o] Error 1
>
> X86ASM=nasm
>
> nasm -v
> NASM version 2.10.09 compiled on Dec 29 2013

Please update your software sometimes, its healthy.